Method and device for requesting and receiving information about other AP corresponding to nontransmitted BSSID set in wireless LAN system

Inventors: Namyeong Kim (Seoul, KR); Insun Jang (Seoul, KR); Jinsoo Choi (Seoul, KR); Sunhee Baek (Seoul, KR)

Assignee: LG ELECTRONICS INC.

H04W76/15 H04W48/14 H04W76/11 H04W84/12

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Quick Facts

Patent No.: US 12690080
App. No.: 18/554,577
Granted: Jul 21, 2026
Kind: B2

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Abstract

Presented are a method and a device for requesting and receiving information about other AP corresponding to a nontransmitted BSSID set in a wireless LAN system. Particularly, a reception MLD transmits a multi-link (ML) probe request frame from a transmission MLD through a first link. The reception MLD receives an ML probe response frame from the transmission MLD through the first link. The transmission MLD includes first and second transmission MLDs. The first transmission MLD includes a first transmission STA operating in the first link. The second transmission MLD includes a second transmission STA operating in the first link, and a third transmission STA operating in a second link. The second transmission STA is a transmission STA corresponding to a first nontransmitted BSSID of a set of multiple BSSIDs on the basis of the first transmission STA.

Claims (86)

1 . A method performed by a non-access point (non-AP) multi-link device (MLD) in a wireless local area network (WLAN) system, the method comprising:

transmitting, by a first non-AP station (STA) affiliated with the non-AP MLD, a Multi-Link (ML) probe request frame to a first AP affiliated with an AP MLD; and

receiving, by the first non-AP STA, an ML probe response frame from the first AP,

wherein the AP MLD includes a first AP MLD and a second AP MLD,

wherein the first AP operating on a first link is affiliated with the first AP MLD,

wherein a second AP operating on the first link and a third AP operating on a second link are affiliated with the second AP MLD,

wherein the first AP is configured as an AP related to a transmitted Basic Service Set Identifier (BSSID) of a first multiple BSSID set, the second AP is configured as an AP related to a first nontransmitted BSSID of the first multiple BSSID set, and the third AP is configured as an AP related to a second nontransmitted BSSID of a second multiple BSSID set,

wherein the first multiple BSSID set is configured for the first link,

wherein the second multiple BSSID set is configured for the second link,

wherein the first non-AP STA operating on the first link and a second non-AP STA operating on the second link are affiliated with the non-AP MLD,

wherein the ML probe response frame includes a multiple BSSID element,

wherein the multiple BSSID element includes a profile of the first nontransmitted BSSID,

wherein the profile of the first nontransmitted BSSID includes a basic ML element,

wherein the basic ML element includes a profile subelement of the third AP,

wherein based on the first non-AP STA requesting updated BSS parameter information for the third AP, the profile subelement of the third AP includes the updated BSS parameter information for the third AP,

wherein the ML probe request frame further includes a probe request ML element,

wherein the probe request ML element includes a profile subelement of the second non-AP STA,

wherein the profile subelement of the second non-AP STA includes a first link Identifier ID) subfield and a Basic Service Set (BSS) Parameters Change Count (BPCC) subfield,

wherein the first link ID subfield includes link ID information of the third AP, and

wherein the BPCC subfield includes a first BPCC value most recently received from the third AP through a beacon frame or a probe response frame.

2 . The method of claim 1 , wherein based on a most recently updated BPCC value of the second AP being referred to as a second BPCC value,

the updated BSS parameter information for the third AP includes update information on elements classified based on a gap between the first BPCC value and the second BPCC value.

3 . The method of claim 1 , wherein the profile subelement of the second non-AP STA further includes a Complete Profile Requested subfield,

wherein based on the updated BSS parameter information for the third AP being partial information, a value of the Complete Profile Requested subfield is set to 0,

wherein based on the updated BSS parameter information for the third AP being complete information, a value of the Complete Profile Requested subfield is set to 1.

4 . The method of claim 1 , wherein the AP MLD further includes a third AP MLD,

wherein the third AP MLD includes a fourth AP operating on the first link,

wherein the fourth AP is configured as an AP related to a second nontransmitted BSSID of the first multiple BSSID set.

5 . The method of claim 4 , wherein based on the first non-AP STA requesting updated BSS parameter information for the second or fourth AP,

the first non-AP STA receives the ML probe response frame from the first AP rather than the second or fourth AP,

the ML probe response frame includes the updated BSS parameter information for the second or fourth AP.

6 . A non-access point (non-AP) multi-link device (MLD) in a wireless local area network (WLAN) system, the non-AP MLD comprising:

a memory;

a transceiver; and

a processor being operatively connected to the memory and the transceiver,

wherein the processor is configured to:

transmit, by a first non-AP station (STA) affiliated with the non-AP MLD, a Multi-Link (ML) probe request frame to a first AP affiliated with an AP MLD; and

receive, by the first non-AP STA, an ML probe response frame from the first AP,